The purpose of this study is to provide a materialization method for high copper-containing wastewater and compare it with conventional chemical precipitation process and ferrite process. In the first stage of mineralization, the copper-containing wastewater was added into a tank with NaOH solution followed by the addition of Fe3+ ion and heated to 70°C. The molar ratio between Fe3+ and divalent metal ions () was given and the pH value of solution was controlled in the strong alkaline range (11.0-11.5). In the inverse mixing method, the whole precipitation process was carried out in the strong alkaline solution, which resulted in the simultaneous precipitation of Fe3+, Cu2+, Ni2+ and Zn2+ ions. The first reaction was complete when the ORP remained constant. Finally, the formation of the magnetic ferrite, Fe2+ ion was added into the solution accompanied by heating and aeration. The magnetic separation could be then used for solid-liquid separation. Therefore, these results reveal that not only the filtrate lies below the regulatory effluent standards, but also the solid products meet the toxicity characteristic leaching procedure standards. Moreover, the solid products are magnetic and have the characteristic of evenly distributed copper ions.
All Science Journal Classification (ASJC) codes
- Water Science and Technology
- Ocean Engineering